Japanese kickboxer Tenshin Nasukawa has hit back at mixed martial artist Conor McGregor after the latter posted a racist remark online about a photo of Nasukawa and Floyd Mayweather, Jr.

Nasukawa and Mayweather were earlier reported to have a bout on New Year’s Eve.

According to the Huffington Post, McGregor posted a photo on Instagram of Mayweather and Nasukawa together at a recent press conference and accompanied this with a caption that has stirred controversy.

McGregor may seem to not know who Nasukawa is, but the 20-year-old is considered a rising star in combat sports.

The Japanese fighter has an undefeated record in both MMA and kickboxing. He is also being hailed as the “next superstar of striking.”

Nasukawa, a southpaw, was unbeaten in four MMA bouts and 27 kickboxing fights, according to The Guardian. He has also won titles across several promotions in the bantamweight and flyweight divisions.

Japanese mixed martial arts company Rizin Fighting Federation earlier announced in a press conference that Nasukawa will face Mayweather in a fight.

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The bout was initially set to happen in Tokyo, Japan, on December 31, but it appears that the fight is off as Mayweather explained he will not be fighting the younger kickboxer.

Mayweather said that he was retired and claimed that he never officially agreed to fight Nasukawa. He also said that he has never heard of Nasukawa until his recent trip to Japan.

Mayweather, who is nearly 22 years Nasukawa’s senior, has not fought since a 10th-round knockout of UFC star McGregor under boxing rules in 2017. He announced his retirement after the fight, but has been teasing of a comeback.